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• W2772471549 startingPage "341" @default.
• W2772471549 abstract "Although bone is regenerative, its regeneration capacity is limited. For bone defects beyond a critical size, further intervention is required. As an attractive strategy, bone tissue engineering (bone TE) has been widely investigated to repair bone defects. However, the rapid and effective bone regeneration of large non-healing defects is still a great challenge. Multifunctional scaffolds having osteoinductivity and osteoconductivity are desirable to fasten functional bone tissue regeneration. In the present study, biomimetic composite scaffolds of collagen and biphasic calcium phosphate nanoparticles (BCP NPs) with a controlled release of dexamethasone (DEX) and the controlled pore structures were prepared for bone TE. DEX was introduced in the BCP NPs during preparation of the BCP NPs and hybridized with collagen scaffolds, which pore structures were controlled by using pre-prepared ice particulates as a porogen material. The composite scaffolds had well controlled and interconnected pore structures, high mechanical strength and a sustained release of DEX. The composite scaffolds showed good biocompatibility and promoted osteogenic differentiation of hMSCs when used for three-dimensional culture of human bone marrow-derived mesenchymal stem cells. Subcutaneous implantation of the composite scaffolds at the dorsa of athymic nude mice demonstrated that they facilitated the ectopic bone tissue regeneration. The results indicated the DEX-loaded BCP NPs/collagen composite scaffolds had high potential for bone TE.Scaffolds play a crucial role for regeneration of large bone defects. Biomimetic scaffolds having the same composition of natural bone and a controlled release of osteoinductive factors are desirable for promotion of bone regeneration. In this study, composite scaffolds of collagen and biphasic CaP nanoparticles (BCP NPs) with a controlled release nature of dexamethasone (DEX) were prepared and their porous structures were controlled by using ice particulates. In vitro cell culture and in vivo implantation experiments demonstrated the composite scaffolds exerted synergistic effects on the osteogenic differentiation of hMSCs and bone regeneration. The composite scaffolds also showed promotive effect on the formation of capillary blood vessels in the regenerated bone. This study is the first research to prepare DEX-loaded BCP NPs/collagen porous composite scaffolds. The superior performance of the composite scaffolds indicates the composite scaffolds should be useful for bone tissue engineering." @default.
• W2772471549 created "2017-12-22" @default.
• W2772471549 creator A5033228141 @default.
• W2772471549 creator A5038270737 @default.
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• W2772471549 date "2018-02-01" @default.
• W2772471549 modified "2023-10-17" @default.
• W2772471549 title "Preparation of dexamethasone-loaded biphasic calcium phosphate nanoparticles/collagen porous composite scaffolds for bone tissue engineering" @default.
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• W2772471549 doi "https://doi.org/10.1016/j.actbio.2017.12.004" @default.
• W2772471549 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29242161" @default.
• W2772471549 hasPublicationYear "2018" @default.
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